Process monitoring, controlling and load management system in an induction motoreSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Process monitoring, controlling and load management system in an induction motoreSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Now in day to day life we have seen that every thing is in digitilized form so this this presentation is ol about the evolution of meter into automatic meter with many technologies.
Its quiet intresting topic and very vast topic too.
GSM Based Device Controlling and Fault DetectionIJCERT
The mobile communication has expanded to a great extent such that it can be applied for controlling of electrical devices. These projects make use of this capability of mobile phone to control three electrical devices with some use of embedded technology which can be extended up to eight devices. Apart from controlling it also does the sensing of the devices. Thus a user can be able to know of the status of the devices and in addition to that the user get notified if any fault is detected. Here in the project controlling and sensing is done for three electrical devices only. According to the user need both of this can be expanded.
Research on wireless Deviation Mode of Foundation Pit Surveying SystemIJRESJOURNAL
ABSTRACT: Aiming at the working principle and measurement method of the active inclinometer which is widely used in the foundation pit engineering, a new automatic inclinometer method is proposed for ZigBee, which is a close-range wireless communication technology. Using the tilt sensor SCA100T, through the DTU data transmission module, the real-time measured data through the microprocessor STC12C5630AD processing sent to the ZigBee network, to achieve the computer's remote monitoring and automatic tilt measurement.
A remote monitoring system for a three phase 10-kva switchable distribution t...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
A remote monitoring system for a three phase 10-kva switchable distribution t...eSAT Journals
Abstract A Remote Monitoring System plays an important role in many applications. This paper proposes an innovative design about the development of remote monitoring system for a three-phase 10-kVA Switchable Distribution transformer with the help of a PIC microcontroller and Zigbee-based Wireless device. The PIC microcontroller from microchip helps in controlling the switching devices and monitoring the current, voltage and temperature of the transformer. The Zigbee-based wireless device is used as long range wireless communication between the modules. The information is transmitted point by point using Zigbee transmitter and receiver and is sent to the server module to check the state of the transformer. It has a data rate speed of 250 Kbps with minimum power consumption and has a transmission distances range from 10 to 100m. The data transmission rate is higher than other wireless systems. This is user friendly and can be achieved at low cost. This handles the transfer of parameters such as voltage, current and temperature as digital data from current transducers, voltage transformers and from temperature sensors to the server module through wireless communication. This system helps in reading sensor, controlling switches, monitoring and data protection. Key Words: Switchable Transformer, PIC Microcontroller and Zigbee
A project report on energy meter monitoring online using wireless transmissio...Robo India
ROBO INDIA presents A project report on Energy Meter monitoring online using wireless Transmission using GSM Modem.
The project reads data from energy meter and uploads it to the server. And we have developed an application that can be accessed through URL that display the data. Thus it is an online mode of data logging and data monitoring.
We welcome all of your views and queries. We are found at
website- http://roboindia.com
mail- info@roboindia.com
Wireless energy meter monitoring with automated tariff calculationUdayalakshmi JK
Electricity billing has become a difficult task. The board has to make regular visit to the consumers house to make the reading. Also it can cause manual error. Now here we are monitoring the energy meter with modern techniques. The total energy consumed by the consumer and the consumption cost is known to the consumer and to the board by means of a hand held device.
LabVIEW Based Monitoring the Building in wireless communicationSathish Kumar
The presented wireless system for building monitoring takes advantage of the unique features of
custom-developed MEMS sensors and read-out ASIC combined with an optimized network and module
architecture, to realize a solution which offers long battery lifetime and potentially low cost in
manufacturing, installation and maintenance, while providing high-quality sensor data at the right
time which can be proposed for monitoring building to assess earthquake damage. Low power network
architecture was implemented over an 802.15.4 MAC in the 900-MHz band.A custom patchantenna
was designed in thisfrequency band to obtain robustlinks in real-worldconditions. The modules have
been validatedin a full-scale laboratory setup with simulated earthquakes. This will be illustrated via
LABVIEW software which shows the Temperature level in the time of Earthquake and which helps in
preventing the human life.
Miniature design of T-Shaped frequency Reconfigurable antenna for S-Band Appl...IJECEIAES
The article presents a miniature antenna with a simple geometry and a simple approach for reconfiguration. In order to make the T-shaped antenna frequency reconfigurable, we integrated Switches in specific positions. The location of the switches is determined following a study of the distribution of the surface currents of the suggested antenna. Indeed, we found that the insertion of switches in places where the concentrations of surface currents are high is irrelevant. In fact, to redirect current flow, the PIN diodes or RF Switch must be placed in positions where the distribution of the surface currents is of low concentration. These locations facilitate the establishment of new trajectories of the flux of current. As a result, a miniature tunable antenna dimension 20mm*20mm*1.6mm printed on FR4 substrate with 4.4 permittivity and with 0.04 loss tangent, the antenna can be adopted in many communication devices in view of its small size, its low manufacturing cost and performance on frequency sweep, the antenna operates in S-Band with an acceptable band and gain. The antenna is simulated and optimized using CST Microwave Studio.
Now in day to day life we have seen that every thing is in digitilized form so this this presentation is ol about the evolution of meter into automatic meter with many technologies.
Its quiet intresting topic and very vast topic too.
GSM Based Device Controlling and Fault DetectionIJCERT
The mobile communication has expanded to a great extent such that it can be applied for controlling of electrical devices. These projects make use of this capability of mobile phone to control three electrical devices with some use of embedded technology which can be extended up to eight devices. Apart from controlling it also does the sensing of the devices. Thus a user can be able to know of the status of the devices and in addition to that the user get notified if any fault is detected. Here in the project controlling and sensing is done for three electrical devices only. According to the user need both of this can be expanded.
Research on wireless Deviation Mode of Foundation Pit Surveying SystemIJRESJOURNAL
ABSTRACT: Aiming at the working principle and measurement method of the active inclinometer which is widely used in the foundation pit engineering, a new automatic inclinometer method is proposed for ZigBee, which is a close-range wireless communication technology. Using the tilt sensor SCA100T, through the DTU data transmission module, the real-time measured data through the microprocessor STC12C5630AD processing sent to the ZigBee network, to achieve the computer's remote monitoring and automatic tilt measurement.
A remote monitoring system for a three phase 10-kva switchable distribution t...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
A remote monitoring system for a three phase 10-kva switchable distribution t...eSAT Journals
Abstract A Remote Monitoring System plays an important role in many applications. This paper proposes an innovative design about the development of remote monitoring system for a three-phase 10-kVA Switchable Distribution transformer with the help of a PIC microcontroller and Zigbee-based Wireless device. The PIC microcontroller from microchip helps in controlling the switching devices and monitoring the current, voltage and temperature of the transformer. The Zigbee-based wireless device is used as long range wireless communication between the modules. The information is transmitted point by point using Zigbee transmitter and receiver and is sent to the server module to check the state of the transformer. It has a data rate speed of 250 Kbps with minimum power consumption and has a transmission distances range from 10 to 100m. The data transmission rate is higher than other wireless systems. This is user friendly and can be achieved at low cost. This handles the transfer of parameters such as voltage, current and temperature as digital data from current transducers, voltage transformers and from temperature sensors to the server module through wireless communication. This system helps in reading sensor, controlling switches, monitoring and data protection. Key Words: Switchable Transformer, PIC Microcontroller and Zigbee
A project report on energy meter monitoring online using wireless transmissio...Robo India
ROBO INDIA presents A project report on Energy Meter monitoring online using wireless Transmission using GSM Modem.
The project reads data from energy meter and uploads it to the server. And we have developed an application that can be accessed through URL that display the data. Thus it is an online mode of data logging and data monitoring.
We welcome all of your views and queries. We are found at
website- http://roboindia.com
mail- info@roboindia.com
Wireless energy meter monitoring with automated tariff calculationUdayalakshmi JK
Electricity billing has become a difficult task. The board has to make regular visit to the consumers house to make the reading. Also it can cause manual error. Now here we are monitoring the energy meter with modern techniques. The total energy consumed by the consumer and the consumption cost is known to the consumer and to the board by means of a hand held device.
LabVIEW Based Monitoring the Building in wireless communicationSathish Kumar
The presented wireless system for building monitoring takes advantage of the unique features of
custom-developed MEMS sensors and read-out ASIC combined with an optimized network and module
architecture, to realize a solution which offers long battery lifetime and potentially low cost in
manufacturing, installation and maintenance, while providing high-quality sensor data at the right
time which can be proposed for monitoring building to assess earthquake damage. Low power network
architecture was implemented over an 802.15.4 MAC in the 900-MHz band.A custom patchantenna
was designed in thisfrequency band to obtain robustlinks in real-worldconditions. The modules have
been validatedin a full-scale laboratory setup with simulated earthquakes. This will be illustrated via
LABVIEW software which shows the Temperature level in the time of Earthquake and which helps in
preventing the human life.
Miniature design of T-Shaped frequency Reconfigurable antenna for S-Band Appl...IJECEIAES
The article presents a miniature antenna with a simple geometry and a simple approach for reconfiguration. In order to make the T-shaped antenna frequency reconfigurable, we integrated Switches in specific positions. The location of the switches is determined following a study of the distribution of the surface currents of the suggested antenna. Indeed, we found that the insertion of switches in places where the concentrations of surface currents are high is irrelevant. In fact, to redirect current flow, the PIN diodes or RF Switch must be placed in positions where the distribution of the surface currents is of low concentration. These locations facilitate the establishment of new trajectories of the flux of current. As a result, a miniature tunable antenna dimension 20mm*20mm*1.6mm printed on FR4 substrate with 4.4 permittivity and with 0.04 loss tangent, the antenna can be adopted in many communication devices in view of its small size, its low manufacturing cost and performance on frequency sweep, the antenna operates in S-Band with an acceptable band and gain. The antenna is simulated and optimized using CST Microwave Studio.
Design And Implementation of Gas Turbine Combustion Chamber Control System Ba...IOSR Journals
Abstract: Wireless Sensor Networks (WSNs) are increasingly being used in various applications such as for
controlling & monitoring purposes in industrial processes. Cost effectiveness is the highly prioritized goal of
communication protocols & application design for WSN. This paper discusses the development of a WSN to
control & monitor Gas Turbine (GT) based Combustion Chamber (CC), which includes the design, development
& implementation of a WSN for real time monitoring & controlling GT based combustion chamber system. The
motive behind this work is to totally eliminate the use of control cables. It may be visualized that the sensors are
placed around the periphery of the CC of the GT. The regulation of pressure & temperature is done using a
radio module attached to a data acquisition board and the prototype circuits designed. Programming of the
sensor nodes and the gateway is done using software. The prototype system developed is based on 2/3 voting
logic for tripping the system if the temperature or pressure goes below or beyond the threshold range. This work
is an initiative to save control cable costs to make gas-based power plants cost effective since no such approach
has been taken regarding WSN application until now.
Keywords: Wireless Sensor Network, Zigbee, Xmesh, Gas Turbine, Combustion Chamber.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Six-port Interferometer for W-band Transceivers: Design and CharacterizationIJECEIAES
The study has presented an extensive analysis of an integrated millimeter wave six-port interferometer, operating over a 10 GHz band, from 80 to 90 GHz. It has covered both semi-unlicensed point-to-point links (81-86 GHz), and imaging sensor system frequencies (above 85 GHz). An in-house process is used to fabricate miniaturized hybrid millimeter wave integrated circuits on a very thin ceramic substrate. Two-port S-parameter measurements are performed on a minimum number of circuits integrated on the same die, exploiting the circuit’s physical symmetry and chosen to collect enough data for full-port characterization. Based on these measurements on an integrated prototype, a six-port circuit computer model implemented and advanced system simulations performed for circuit analysis. Interferometer performances evaluated using several methods: analysis of harmonic balance, qi points’, homodyne quadrature demodulation, and error vector modulation (EVM). The analysis showed that this circuit can directly perform, without any calibration, the demodulation of various PSK and QAM signals over the 10 GHz band, with very good results.
Cetc11 - Wireless Magnetic Based Sensor System For Vehicles ClassificationNokia Networks
This paper presents a full pre-industrial prototype implementation of an innovative system capable to
detects vehicles and classify them. This work study the architecture of a full autonomous road sensor
network that count and classify passing vehicles, reducing the impact of conventional wired systems in
roads, by dramatically reducing their installation and operational costs. The power supply can be supported
either by solar harvest or by none rechargeable batteries. For communications the IEEE 802.15.4 with
ZigBee on top are used to transmit digitalized vehicle’s magnetic analogue signatures up to a vehicles
classification server. This information is acquired using a magnetometer translating in voltage the variation
of the natural magnetic field of the earth caused by ferromagnetic components of a vehicle passing over the
sensor. Results show clearly that it is possible to distinguish vehicles magnetic signatures per model and
class even at different speeds.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
Ieeepro techno solutions ieee embedded project - low power wireless sensor network for building monitoring
1. R
S S S S
A
AR
A
A
A
A
AR
A
S strain sensormodulestrain sensormodulesatbasement
A accelerometermodule
AR accelerometer-router
R roof router
B
B base station
directional link
>1km line of sight
Figure 1. Architecture of the sensor network for building monitoring
Low Power Wireless Sensor Network
for Building Monitoring
Tom Torfs, Tom Sterken* Steven Brebels, Juan
Santana+
, Richard van den Hoven+
, Chris Van Hoof
IMEC, Leuven, Belgium;
*IMEC / Ghent University, Ghent, Belgium;
+
IMEC / Holst Centre, Eindhoven, The Netherlands
Contact e-mail : torfst@imec.be
Nicolas Saillen, Nicolas Bertsch*, Davide Trapani+
,
Daniele Zonta+
, Paris Marmarasº, Matthaios Bimpasx
Thermo Fisher Scientific, Enschede, The Netherlands
*MEMSCAP, Crolles, France;
+
University of Trento, Trento, Italy;
ºNetScope Solutions, Athens, Greece; x
ICCS, Athens, Greece
Abstract— A wireless sensor network is proposed for monitoring
buildings to assess earthquake damage. The sensor nodes use
custom-developed capacitive MEMS strain and 3D acceleration
sensors and a low power readout ASIC for a battery life of up to
12 years. The strain sensors are mounted at the base of the
building to measure the settlement and plastic hinge activation
of the building after an earthquake. They measure periodically
or on-demand from the base station. The accelerometers are
mounted at every floor of the building to measure the seismic
response of the building during an earthquake. They record
during an earthquake event using a combination of the local
acceleration data and remote triggering from the base station
based on the acceleration data from multiple sensors across the
building. A low power network architecture was implemented
over an 802.15.4 MAC in the 900MHz band. A custom patch
antenna was designed in this frequency band to obtain robust
links in real-world conditions.
I. INTRODUCTION
Buildings can progressively accumulate damage during
their operational lifetime, due to seismic events , unforeseen
foundation settlement, material aging, design error, etc.
Periodic monitoring of the structure for such damage is
therefore a key step in rationally planning the maintenance
needed to guarantee an adequate level of safety and
serviceability. However, in order for the installation of a
permanently installed sensing system in buildings to be
economically viable[1], the sensor modules must be wireless
to reduce installation costs, must operate with a low power
consumption to reduce servicing costs of replacing batteries,
and use low cost sensors that can be mass produced such as
MEMS sensors. The capability of MEMS and wireless
networking for monitoring civil structures is well documented
[2][3][4]. The presented work addresses all of the above
requirements.
II. SYSTEM ARCHITECTURE
A. Network architecture
The monitoring system consists of two types of sensor
modules: strain sensing modules and acceleration sensing
modules. They are placed in the building as shown in Fig. 1.
The strain sensor modules are mounted at the lowest level of
the building, to estimate the vertical column loads and any
variation due to settlement. Horizontal acceleration is
measured by two 3D acceleration sensing modules (where
only the two horizontal axes are really required) at each level
during an earthquake, allowing analysis of the seismic
response of the whole structure. A typical 7-story, 24-column
building requires approx. 72 strain sensors (3 per column) and
14 accelerometer modules (2 per floor).
The data is wirelessly transmitted to a nearby base station
using a line of sight link with a range of >1km. The line of
sight link uses directional antennas to improve the link budget,
but not so directional that alignment is required, which could
pose a problem during seismic events. The receiver base
station can store and process the data or forward them,
immediately or later, using classical wide area network
connection technology. In this way, provided all modules as
well as the receiver base station have battery back-up power,
the data acquired during seismic events can be properly
recorded even in case of outages of the electric power and/or
communication networks.
In order to form a robust wireless link from all modules,
including the strain sensor modules at the basement of the
building, towards the receiver base station, a multi-hop
network architecture is used as shown in Fig. 1. On the roof of
Work performed in the MEMSCON project, funded by the European
Commission (FP7, contract number 036887), website: www.memscon.com
2. Radio
control
(ATMega)
patch
antenna
MEMS 3D
accelero‐
meter
Sensor
read‐out
ASIC
Sensor
control
(MSP430)
ADC
(16‐bit)
Memory
64Kx16
Radio
802.15.4
900MHz
Battery
(lithium 3.6V)
wireless module
Power
regulation
circuit
MEMS
strain sensor
4‐wire cable
(max length: 1.5m)
Sensor
read‐out
ASIC
concrete‐embedded module
OR
Figure 2. Block diagram of the sensor module with either a built-in
accelerometer or a separate strain sensor module embedded in the concrete
(a) (b) (c)
5 cm
Figure 3. Picture of the wireless sensor module:
(a) antenna, (b) electronics, (c) battery
the building a dedicated router module (without sensor) is
placed to forward the data between the sensor network and the
receiver base station. Some accelerometer modules on
intermediate floors can be configured as additional
intermediate routers when required to obtain a robust link
from all sensor modules in the building towards the roof router
module. As shown on Fig. 1, it is recommended to place the
router modules in or close to the stairwell for improved
vertical floor-to-floor propagation through the building.
For lowest power consumption in the sensor modules, the
network is implemented using indirect data transfer using
polling on top of a standard 802.15.4 MAC. In this way, the
end nodes’ radio is powered down most of the time. Only the
routers and base station have their receivers constantly on. To
avoid rapid battery depletion, the modules with router
functionality are mains-powered through an AC/DC adapter,
with the battery serving only for back-up power in case mains
power is interrupted. The end nodes are battery powered only.
B. Sensor module architecture
The block diagram of the sensor modules is shown in Fig.
2 and a picture in Fig. 3. Both the accelerometer and strain
sensing variants of the module use the same core components.
For installation into the building these components are placed
into a standard off-the-shelf plastic casing that can be
conveniently mounted on the floor, wall or ceiling using
screws, and offering access for sporadic battery replacement if
needed. The core components are:
1) A custom-developed low power capacitive sensor
read-out ASIC [5]. This ASIC can be matched to either
MEMS-based comb finger capacitive accelerometers or strain
sensors in a half-bridge configuration. Its gain can be set by a
number of integration pulses N, optimizing signal-to-noise
ratio and bandwidth with power. In addition, the architecture
suppresses residual motion artifacts. In combination with the
MEMS strain sensor, it can measure a range of ± 20,000με
with a resolution of 10με and non-linearity <0.6%. In
combination with the MEMS accelerometer it can measure an
acceleration range of ±2.5g with a resolution of 80dB (13-bit)
for vibrations between 10-100Hz and a non-linearity <1%.
2) A low power 16-bit successive-approximation analog-
to-digital converter (Analog Devices AD7683).
3) A low power microcontroller (TI MSP430) to control
the sensor data acquisition and temporarily store the data in a
64Kx16bit SRAM memory (Cypress CY62126) .
4) A low power wireless IEEE 802.15.4-compatible
module (Atmel ATZB-900) operating in the 900MHz band.
This frequency band was chosen in preference to the more
common 2.4GHz band because it offers a larger propagation
range for the wireless communication. The wireless module
includes a radio chip (Atmel AT86RF212) and a baseband
microcontroller (Atmel AVR) which needs to be active only
during wireless communication events.
5) A custom patch antenna was designed for the modules.
The patch antenna is tuned for 868MHz operation with an
efficiency of 51% using standard FR4 material as the
substrate. Its size is 5 x 5 x 1.3 cm3
. Its shape and radiation
pattern is optimized for wall-, floor- and ceiling-mounting in
the building.
6) The modules are powered by a an 8.5Ah C-cell long
operating life primary Lithium Thionyl Chloride battery
(Tadiran SL-2770), suitable for 10 to 25 years of operation.
The accelerometer consists of 2 transverse comb finger
structures for the X and Y axis and a pendulating one for the Z
axis and was fabricated with a surface micro-machined
process from a 85μm thick SOI wafer. It has 78 fingers with a
total sensitivity of 2.02pF/g. The Z sensor has an area of
2.17mm2
per plate. Innovative cap through connections were
used. The main tradeoff in the design of the accelerometer is
the sensitivity-bandwidth-linearity in all three axes, a
challenge for the design given the different used structures.
The XY and Z accelerometers are packaged together with the
readout ASIC into a system-in-a-package and then mounted
onto the printed circuit board as can be seen on Fig. 3.
The MEMS strain sensor is a longitudinal comb finger
capacitor. The strain sensor fabrication procedure starts with a
SOI wafer with a 500μm thick handle, 50μm thick fingers and
2μm thick oxide layer with 400 fingers in the sensor and it has
a sensitivity of 0.133fF/μe. Two anchors were etched-out of
the surface to create the necessary clamps to attach the sensor
to the rebar of a pillar. The fingers are protected with a
borosilicate class cap.
3. (a)
(b)
PDMS
Strainsensor
Wire bonds
Printed circuit board
Components
Cable (I/O)Polyimideor
steel carrier
Figure 4. Strain sensing front-end module
(a) picture of a realization on a steel carrier (b) diagram
0.000
0.200
0.400
0.600
0.800
1.000
1.200
1.400
1.600
1.800
Strain sensor Accelerometer
Power consumption (mW)
Standby
Sampling &storage
Sensor& readout
Processing
Radio transmission
Radio polling
Power conversion
loss
Figure 5. Sensor module power consumption breakdown
The MEMS strain sensor is packaged together with the
readout ASIC into a special front-end strain sensing module
(Fig. 4) which is to be embedded inside the reinforced
concrete onto the reinforcing bar, preferably prior to the
pouring of the concrete. The sensor is mounted on a polyimide
or steel carrier which in turn is glued (or in case of steel, could
also be welded) onto the reinforcing bar. The module is
molded in PDMS silicone to protect the components from the
environment during installation and pouring of concrete, while
remaining a mechanically compliant package to avoid
distorting the strain sensor measurement.This front-end strain
sensing module is connected to the rest of the module with a
small 4-wire cable with a maximum length of 1.5m.
The use of custom-developed MEMS sensors and read-out
ASIC allows to meet the specific requirements of the building
monitoring application and differentiates the presented system
from the earlier prototype system presented in [6] and [7].
C. Measurement initiation and radio polling
1) Accelerometer modules
The main trigger for the recording of an acceleration
measurement is the detection of the start of an earthquake. The
detection can happen in two ways:
a) The output of the built-in accelerometer in a selected
number of monitoring nodes exceeds a certain minimum
threshold, during a certain minimum time; these monitoring
nodes alert the base station which will decide whether to
wake up the entire network of acceleration sensing nodes
over the radio The monitoring nodes are selected based on
their location and amount of environmental noise; ground-
level nodes may be suitable candidates, provided they are
sufficiently far removed from disturbance sources such as
heavy traffic. The selection of monitoring nodes can be done
dynamically from the base station. This allows for example to
disable the monitoring function on nodes that report
unusually high numbers of false alarms. To that purpose, the
hardware and software of the monitoring nodes are identical
to that of the non-monitoring nodes. The monitoring function
is an optional function which can be enabled or disabled
during operation by the base station.
b) An external source of earthquake detection can be
coupled to the base station, which can use such information in
addition to possible information from monitoring nodes to
decide whether to wake up the entire network or not.
In both of these cases the wake-up of (most of) the
acceleration sensing nodes to initiate measurement has to be
done over the radio link. This also implies that it is possible to
wake up the nodes via the base station over the radio link at
any chosen time independent of the presence of an earthquake,
which is a desired functionality for testability and monitoring
of the system. It also means that all modules in the network
will be woken up during a detected event, even if the
accelerations locally at some modules have not (yet) reached a
value exceeding the trigger threshold.
It is required to be able to record the early onset of an
earthquake event, even before and certainly no later than 1 ms
after it reaches a pre-set trigger threshold. In order to do this,
the accelerometer is constantly running at 3 x 200Hz sample
rate with the measurements recorded in a 54-second loop
buffer., This requires an ultra low power sensor and readout.
The power consumption of the 3D accelerometer and 3-
channel readout operating continuously is 125 µA at 3V.
The node must be woken up within 54 seconds after the
start of the recording of interest to avoid the loop buffer
overflowing which would lead to data loss. To respond timely
to an event triggered from the base station, the radio polling
interval of the accelerometer modules is set to 15 seconds.
Once the event trigger is reached the loop buffer contents are
preserved and once the buffer is full recording will continue in
4. Figure 6. (a) Building scale model in the lab with the wireless accelerometer modules and reference accelerometers installed
(b) Evaluation result comparing the proposed wireless accelerometer to the reference accelerometer output
a secondary 54-second buffer until the next event trigger.
2) Strain sensor modules
The main measurement scenario for the strain sensor is a
periodic readout. Samples are taken at a configurable sample
rate between 2 seconds and 18 hours. The strain sensor
modules use a radio polling interval of 60 seconds. This also
allows manual wake-up functionality from the base station,
again useful for monitoring and testability reasons. Unlike for
the accelerometers, in the case of the strain sensors the sensor
and read-out ASIC can be entirely shut down between
measurements. This results in a lower power consumption and
longer battery life. Since a typical building requires many
more strain sensors than accelerometer modules, it is useful
for the strain sensors to have the longest battery service life.
III. RESULTS
A. Power consumption
Fig. 5 shows the breakdown of the power consumption in
the sensor modules for strain sensor and accelerometer
modules. The total average power consumption is 0.274mW
for the strain sensor modules and 1.73mW for the
accelerometer modules. With the abovementioned C-cell size
battery this implies a battery life of 12 years for the strain
sensor modules and 2 years for the accelerometer modules.
B. Laboratory validation
Fig. 6 shows a lab setup on a scale model of the building
used to validate the accelerometer modules. For this test, the
custom patch antenna was not used, but a standard whip
antenna was used instead. The result shows a very good
correlation between the reference accelerometers and the
proposed wireless modules.
The strain sensor modules were preliminarily validated in
a calibration setup and show sensitivities between 10 and 20
με/mV, varying from sensor to sensor.
CONCLUSION
The presented wireless system for building monitoring
takes advantage of the unique features of custom-developed
MEMS sensors and read-out ASIC combined with an
optimized network and module architecture, to realize a
solution which offers long battery lifetime and potentially low
cost in manufacturing, installation and maintenance, while
providing high-quality sensor data at the right time.
REFERENCES
[1] Pozzi M., D. Zonta, W. Wang and G. Chen. 2010. “A framework for
evaluating the impact of structural health monitoring on bridge
management”. Proc. 5th International Conf. on Bridge Maintenance,
Safety and Management (IABMAS2010), Philadelphia, 11-15 Jul 2010.
[2] Lynch, J.P. and K.J. Loh. 2006. “A summary review of wireless
sensors and sensor networks for structural health monitoring,” The
shock and vibration digest, 38(2):91-128.
[3] Zonta, D., M. Pozzi, and P. Zanon. 2008. “Managing the Historical
Heritage Using Distributed Technologies,” International Journal of
Architectural Heritage, 2:200-225.
[4] Kruger, M., C.U. Grosse and P.J. Marron, 2005. “Wireless Structural
Health Monitoring Using MEMS”, Key Engineering Materials 293-
294: 625-634.
[5] J. Santana,R. van den Hoven,C. van Liempd, M. Colin, N. Saillen, C.
Van Hoof, "A 3-axis accelerometer and strain sensor system for
building integrity monitoring", Proc. 16th International Conference on
Solid-State Sensors, Actuators, Microsystems, Beijing, June 5-9, 2011.
[6] A. Amditis, Y. Stratakos, D. Bairaktaris, M. Bimpas, S.
Camarinopolos, S. Frondistou-Yannas, et al., "An overview of
MEMSCON project: an intelligent wireless sensor network for after-
earthquake evaluation of concrete buildings", Proc. "14th European
Conference on Earthquake Engineering (14ECEE)", Ohrid, FYROM,
30 Aug - 03 Sep, 2010.
[7] A. Amditis, Y. Stratakos, D. Bairaktaris, M. Bimpas, S.
Camarinopolos, S. Frondistou-Yannas, et al. "Wireless sensor network
for seismic evaluation of concrete buildings", Proc. " 5th European
Workshop on Structural Health Monitoring (EWSHM 2010)", Sorrento,
Italy, 29 Jun - 02 Jul, 2010.